docs: def class_wise_count(self, event_label):
          """Class-wise counts (Nref and Nsys)
  
          Returns
          -------
          dict
              results in a dictionary format
  
          """
  
          return {
              'Nref': float(self.class_wise[event_label]['Nref']),
              'Nsys': float(self.class_wise[event_label]['Nsys'])
          }